Question

multiple-choice question
before i finish counting, how many squares show the round and yellow trait?
9
1
3
16

Explanation:

In a dihybrid cross for pea plant traits (round - R, wrinkled - r; yellow - Y, green - y), the phenotypic ratio for a typical dihybrid cross (RrYy × RrYy) is 9:3:3:1, where 9 represents the number of offspring with the dominant traits for both characteristics (round and yellow in this case). By looking at the Punnett square (even partially counted as per the problem's context), the number of squares with round (dominant, R - related) and yellow (dominant, Y - related) traits follows this 9:3:3:1 ratio, so the number is 9.

Answer:

A. 9